Sharpening jig



P 1938? R. KEITH 3 SHARPENING JIG Filed Aug. 6, 1937 2 Sheets-Sheet l 6 7 Inventor A iiorney s Sept. 27, 1938. R KEITH SHARPENING JIG I Filed Aug. 6, 1957 2 Sheets-Sheet 2 Inventor 7% Patented Sept. 27, 1938 UNITED STATES,

PATENT OFFICE SHARIIENINGY JIG Raymond L. Keith, De Land, Fla. A plication August 6, 1937, Serial No.; '7,794

'2 Claims. (01. 51158) This invention is a sharpening jig and has as its object the provision of a device of this character particularly designed for sharpening chisels, bits, and the blades of planes and analogous tools; and the invention together with its objects and advantages will be best understood from the following description taken in connection with the accompanying drawings wherein,

Figure 1 is a side elevational View of the jig,

Figure 2 is a top plan of the base of the jig,

Figure 3 is a top plan view of the plate assembly forming part of the jig,

Figure 4 is a perspective view of a blade supporting member,

Figure 5 is a perspective view of the upper end of a supporting post.

Referring to the drawings more in detail it will be seen that in the preferred embodiment thereof, the sharpening jig comprises a base plate 5 provided in the top face thereof and adjacent opposite longitudinal edges thereof with longitudinally spaced, continuous grooves 6, elongated longitudinally of the base plate.

Between one pair of grooves, as for example the grooves 6, plate 5 accommodates thereon an oil stone 8 or other suitable abrasive element; plate 5 having struck-up therefrom suitably positioned retaining clips or ears 9 to engage at opposite sides and the respective opposite end edges of the abrasive element 8.

A relatively shorter rectangular plate I0 is supported at one end thereof through the medium of legs or standards I I and at the relatively opposite end thereof through the medium of legs or standards |2.

The legs or standards I l are provided in their lower ends with sockets to accommodate balls or other suitable anti-friction elements l3 that ride in the grooves 6. At their upper ends the legs or standards II have reduced extensions l4 that extend through openings provided in the corner portions of the plate It! and are provided with collars |5 that are retained on the extensions |4 against rotative movement, but in a manner to permit longitudinal or vertical movement of the collars on the ends l4 through the medium of pins |6 that are accommodated in slots provided in the ends M of the legs or standards Springs l8 are disposed about the reduced ends M of the legs or standards I and are interposed between the plate In and shoulders l9,

Resting flatly on the plate I0 is a smaller plate that is secured at the desired angular adjustment on the plate l0 through the medium of wing nut equipped bolts 2| rising from the plate It) and accommodated in arcuate slots 22 provided in plate 20 adjacent to relatively opposite ends of the plate as shown in Figure 3.

Plate 20 is disposed over an opening 23 provided in the plate I0, and is itself equipped'with a rectangular opening 24 that accommodatesthe blade 25 to be sharpened.

Adjacent one end of the opening 24 plate 20 has struck-up therefrom a web 26 through which is threaded a clamping bolt 21 provided with a clamping head 28.

At opposite sides of the opening, there are provided integral depending flanges 29 between the lower corners of which is pivoted as at 30 a blade supporting plate or member 3|.

Plate 3| has hinged to the underside thereof as at 32, a slotted supporting brace 33 that is adapted to rest on the plate 20 and accommodates in the slot thereof a wing nut equipped bolt 34 rising from the plate 20. Obviously through the medium of the brace 33 and wing nut equipped bolt 34 the blade supporting plate 3| may be held in the desired angle of inclination with the blade 25 to be sharpened clamped between the plate 3| and the head 28 of adjusting screw 21, as will be clear from a study of Figure .1.

It will thus be seen that with this device the blade 25 is held at the desired angle of inclination with the edge thereof to be sharpened engaging the top surface of the abrasive block 8.

With the blade thus supported in engagement with abrasive block 8 the carriage 35 consisting of the aforementioned plate l0, plate 20 and associated parts, legs II, and the legs |2, which latter at their upper ends are riveted to one end of the plate ID at the corners thereof, and at their lower ends are provided with sockets accommodating balls or anti-friction elements 36 working in the grooves I, said carriage 35 may be caused to travel back and forth and laterally from one side to the other as controlled by the cooperating grooves Band balls l3, and cooperating grooves and balls 36 so that the edge of the blade 25 is moved in corresponding direction over the surface of the block 8 to effect a sharpening of the blade edge in a positive, quick and eflicient manner. Obviously by adjusting the plate 20 to the desired angle relative to the plate I0 the edge of the blade to be sharpened may be held in the desired oblique angle to the length of the abrasive stone 8 as may be required for a more effective sharpening of the blade edge.

Also springs |8 provide a yielding support for one end of the plate l and associated parts plate provided in the top surface thereof with pairs of opposed, endless elongated grooves, means on said base plate for engaging and securing an abrasive block in position on the base plate, a carriage including a plate, suppdrting legs for the" plate, and anti-friction means on the lower ends.

of the supporting legs engaging in saidgrooves for controlling the direction of movement of said carriage relative to said plate and the abrasive element thereon, and a blade holding and clamping device mounted on the plate of said carriage, said blade holdingand clamping device including an apertured plate mounted on the carriage plate and provided at one end of said aperture with an upwardly directed flange, a clamping screw threaded through an opening in said flange, said apertured plate also having flanges depending therefrom at opposite sides ofthe aperture, a blade supporting member pivoted at one end between said flanges, interengaging means on said apertured plate and said blade supporting memberrfor securing the latter at the desired position of angular adjustment, said blade supporting member and said clamping screw cooperating to .clamp a blade to be sharpened therebetween.

2. A blade sharpening jig comprising a base plate provided in the top surface thereof with pairs of opposed, endless elongated grooves, means on said base plate for engaging and securing an abrasive block in position on the base plate, a carriage including a plate, supporting legs for the plate, and anti-friction means on the lower ends of the supporting. legs engaging in said grooves for controlling the direction of movement of said carriage relative to said plate and the abrasive element thereon, and a blade holding and clamping device mounted on the plate of said carriage, said blade holding and clamping device including an apertured plate mounted on the carriage plate and provided at one end of said aperture with an upwardly directed flange, a clamping screw threaded through an opening in said flange, said apertured plate also having flanges dependingtherefrom at opposite sides of the aperture; a blade supporting member pivoted at one end between said flanges, interengaging means on said apertured plate and said blade supporting member for securing the latter at the desired position of angular adjustment, said blade supporting member and said clamping screw cooperating to clamp a blade to be sharpened therebetween, and" means resiliently connecting said carriage plateat one, end thereof to its supporting legs whereby pressure of the blade to be sharpened against the abrasive element may be regulated at the will of the operator, and means for securing said apertured plate on the carriage plate for angular adjustment relative to the carriage plate.

RAYMOND L. KEITH. 

